The network quoted an unidentified source as saying up to three raids were being carried out in the Molenbeek district in connection with the Paris attacks but police were not immediately available for comment.
RTBF said one man was arrested.
The French-language tabloid newspaper La Derniere Heure added that the raids were carried out to find evidence in homes of three young people who it claimed took part in the attacks.
In Paris, several witness reported that some of the attackers arrived in a vehicle with Belgian license plates.
Belgium's deputy prime minister and interior minister Jan Jambon today said there was "for now no evidence of Belgium involvement" in the attacks, according to an interview on Flemish VRT television.
"RTL said there would be a press confernce later by the prosecutor's office.